Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0f374321d06b895…

MALICIOUS

PDF

75.1 KB Created: 2021-09-09 20:52:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b356dce62312e5d6b9b5331bb237c425 SHA-1: 8a40571b9a5715459774c5d08cfd2faaa0f7637b SHA-256: c0f374321d06b895a649cc94ff53227d4db4e93ed9906f15f1e90d5f2dc317a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure, but the overall structure and URL analysis strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://studiomistretta.com/userfiles/files/buzoxeb.pdf In PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/c3f8324797c2182cf234186d3b2504bc/nasasufekofotoxip.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/83066854064.pdfIn PDF document text
    • http://gradn.ru/uploades/fckeditorfile/78692963649.pdfIn PDF document text
    • http://flemingdecal.com/uploads/assets/file/98591157182.pdfIn PDF document text
    • https://insolite.lu/img/userfiles/files/bokarezuwudekodetatibe.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/161387b89180f8---96355376367.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/govezedu.pdfIn PDF document text
    • http://fishingas.com/userfiles/file/30167587323.pdfIn PDF document text
    • http://kbautotech.com/board/datafiles/imagefile/jutofinelotepowabaso.pdfIn PDF document text
    • http://studiolorenzino.eu/userfiles/files/dufumunekutoxumozumadixo.pdfIn PDF document text
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/dilosenukujo.pdfIn PDF document text
    • https://indicaperu.com/userfiles/file/mazatafufuva.pdfIn PDF document text
    • http://autavrabek.cz/obrazky/file/gukujavemabipazu.pdfIn PDF document text
    • http://rainternacional.com/userfiles/file/sakoruvamam.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/gefalozawijuzuribatugala.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16138509ec0e35---82310601940.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/voratenidudew.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16130afceb1190---venuzowir.pdfIn PDF document text
    • http://applexin.com/ttpsea/files/file/vibopipok.pdfIn PDF document text
    • https://ou-ravda.com/ckfinder/userfiles/files/gojoxuwexitumuluzogu.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f05be146fc---sidonowupix.pdfIn PDF document text
    • https://praktijk-fix.nl/userfiles/image/file/buralu.pdfIn PDF document text
    • http://getsolarny.com/userfiles/file/2284089313.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=car+parking+multiplayer+3d+mod+apkPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c1f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1F2 16616 bytes
SHA-256: c671fabc64850a4b7abc0cf83e4cd9a03eaaa9966c247e0e4dada66500db967b
font_01_sfnt_off0000ec81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC81 11076 bytes
SHA-256: 311c37d8db0192884d38a5dc614d8c3af485d85451f52275640928ec7b0b6d03
font_02_sfnt_off00010626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10626 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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